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Commit2bcf078

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Re-disallow Memoize for parameterized nested loops with join filters
This was previously fixed in9e21537 but got broken again as a resultof2489d76. It seems that commit causes ppi_clauses to containduplicate clauses and it's no longer safe to check the list_length ofthat list to determine if there are join conditions other than what'smentioned in ppi_clauses.Here we adjust the check to count the distinct rinfo_serial mentioned inppi_clauses. We expect that extra->restrictlist won't have duplicaterinfo_serials.Reported-by: Amadeo GallardoAuthor: Richard GuoDiscussion:https://postgr.es/m/CADFREbW-BLJd7-a5J%2B5wjVumeFG1ByXiSOFzMtkmY_SDWckTxw%40mail.gmail.comBackpatch-through: 16, where2489d76 was introduced.
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‎src/backend/optimizer/path/joinpath.c‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -635,7 +635,7 @@ get_memoize_path(PlannerInfo *root, RelOptInfo *innerrel,
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*/
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if (extra->inner_unique&&
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(inner_path->param_info==NULL||
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list_length(inner_path->param_info->ppi_clauses)<
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bms_num_members(inner_path->param_info->ppi_serials)<
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list_length(extra->restrictlist)))
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returnNULL;
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